Re: Ceph fails to recover

Jean-Charles Lopez <jelopez@xxxxxxxxxx> · Wed, 20 Sep 2017 08:30:25 -0700

Hi,
you can play with the following 2 parameters:
osd_recovery_max_active
osd_max_backfills

The higher the number the higher the number of PGs being processed at the same time.

Regards
Jean-Charles LOPEZ
jeanchlopez@xxxxxxx

JC Lopez
Senior Technical Instructor, Global Storage Consulting Practice
Red Hat, Inc.
jelopez@xxxxxxxxxx
+1 408-680-6959

On Sep 20, 2017, at 08:26, Jonas Jaszkowic <jonasjaszkowic.work@xxxxxxxxx> wrote:

Thank you, that is very helpful. I didn’t know about the osd_max_backfills option. Recovery is now working faster. 
What is the best way to make recovery as fast as possible assuming that I do not care about read/write speed? (Besides
setting osd_max_backfills as high as possible). Are there any important options that I have to know?

What is the best practice to deal with the issue recovery speed vs. read/write speed during a recovery situation? Do you
have any suggestions/references/hints how to deal with such situations?

Am 20.09.2017 um 16:45 schrieb David Turner <drakonstein@xxxxxxxxx>:

To help things look a little better, I would also stop the daemon for osd.6 and mark it down `ceph osd down 6`.  Note that if the OSD is still running it will likely mark itself back up and in on its own.  I don't think that the OSD still running and being up in the cluster is causing the issue, but it might.  After that, I would increase how many PGs can recover at the same time by increasing osd_max_backfills `ceph tell osd.* injectargs '--osd_max_backfills=5'`.  Note that for production you'll want to set this number to something that doesn't negatively impact your client IO, but high enough to help recover your cluster faster.  You can figure out that number by increasing it 1 at a time and watching the OSD performance with `iostat -x 1` or something to see how heavily used the OSDs are during your normal usage and again during recover while testing the settings.  For testing, you can set it as high as you'd like (probably no need to go above 20 as that will likely saturate your disks' performance) to get the PGs out of the wait status and into active recovery and backfilling.

On Wed, Sep 20, 2017 at 10:03 AM Jonas Jaszkowic <jonasjaszkowic.work@xxxxxxxxx> wrote:
Output of ceph status:
    cluster 18e87fd8-17c1-4045-a1a2-07aac106f200
     health HEALTH_WARN
            1 pgs backfill_wait
            56 pgs degraded
            1 pgs recovering
            55 pgs recovery_wait
            56 pgs stuck degraded
            57 pgs stuck unclean
            recovery 50570/1369003 objects degraded (3.694%)
            recovery 854/1369003 objects misplaced (0.062%)
     monmap e2: 1 mons at {ip-172-31-16-102=172.31.16.102:6789/0}
            election epoch 4, quorum 0 ip-172-31-16-102
        mgr active: ip-172-31-16-102
     osdmap e247: 32 osds: 32 up, 31 in; 1 remapped pgs
            flags sortbitwise,require_jewel_osds,require_kraken_osds
      pgmap v10860: 256 pgs, 1 pools, 1975 GB data, 111 kobjects
            2923 GB used, 6836 GB / 9760 GB avail
            50570/1369003 objects degraded (3.694%)
            854/1369003 objects misplaced (0.062%)
                 199 active+clean
                  55 active+recovery_wait+degraded
                   1 active+remapped+backfill_wait
                   1 active+recovering+degraded
  client io 513 MB/s rd, 131 op/s rd, 0 op/s wr

Output of ceph osd tree:

ID  WEIGHT  TYPE NAME                 UP/DOWN REWEIGHT PRIMARY-AFFINITY
 -1 9.83984 root default
 -2 0.30750     host ip-172-31-24-96
  0 0.30750         osd.0                  up  1.00000          1.00000
 -3 0.30750     host ip-172-31-30-32
  1 0.30750         osd.1                  up  1.00000          1.00000
 -4 0.30750     host ip-172-31-28-36
  2 0.30750         osd.2                  up  1.00000          1.00000
 -5 0.30750     host ip-172-31-18-100
  3 0.30750         osd.3                  up  1.00000          1.00000
 -6 0.30750     host ip-172-31-25-240
  4 0.30750         osd.4                  up  1.00000          1.00000
 -7 0.30750     host ip-172-31-24-110
  5 0.30750         osd.5                  up  1.00000          1.00000
 -8 0.30750     host ip-172-31-20-245
  6 0.30750         osd.6                  up        0          1.00000
 -9 0.30750     host ip-172-31-17-241
  7 0.30750         osd.7                  up  1.00000          1.00000
-10 0.30750     host ip-172-31-18-107
  8 0.30750         osd.8                  up  1.00000          1.00000
-11 0.30750     host ip-172-31-21-170
  9 0.30750         osd.9                  up  1.00000          1.00000
-12 0.30750     host ip-172-31-21-29
 10 0.30750         osd.10                 up  1.00000          1.00000
-13 0.30750     host ip-172-31-23-220
 11 0.30750         osd.11                 up  1.00000          1.00000
-14 0.30750     host ip-172-31-24-154
 12 0.30750         osd.12                 up  1.00000          1.00000
-15 0.30750     host ip-172-31-26-25
 13 0.30750         osd.13                 up  1.00000          1.00000
-16 0.30750     host ip-172-31-20-28
 14 0.30750         osd.14                 up  1.00000          1.00000
-17 0.30750     host ip-172-31-23-90
 15 0.30750         osd.15                 up  1.00000          1.00000
-18 0.30750     host ip-172-31-31-197
 16 0.30750         osd.16                 up  1.00000          1.00000
-19 0.30750     host ip-172-31-29-195
 17 0.30750         osd.17                 up  1.00000          1.00000
-20 0.30750     host ip-172-31-28-9
 18 0.30750         osd.18                 up  1.00000          1.00000
-21 0.30750     host ip-172-31-25-199
 19 0.30750         osd.19                 up  1.00000          1.00000
-22 0.30750     host ip-172-31-25-187
 20 0.30750         osd.20                 up  1.00000          1.00000
-23 0.30750     host ip-172-31-31-57
 21 0.30750         osd.21                 up  1.00000          1.00000
-24 0.30750     host ip-172-31-20-64
 22 0.30750         osd.22                 up  1.00000          1.00000
-25 0.30750     host ip-172-31-26-255
 23 0.30750         osd.23                 up  1.00000          1.00000
-26 0.30750     host ip-172-31-18-146
 24 0.30750         osd.24                 up  1.00000          1.00000
-27 0.30750     host ip-172-31-22-16
 25 0.30750         osd.25                 up  1.00000          1.00000
-28 0.30750     host ip-172-31-26-152
 26 0.30750         osd.26                 up  1.00000          1.00000
-29 0.30750     host ip-172-31-24-215
 27 0.30750         osd.27                 up  1.00000          1.00000
-30 0.30750     host ip-172-31-24-138
 28 0.30750         osd.28                 up  1.00000          1.00000
-31 0.30750     host ip-172-31-24-10
 29 0.30750         osd.29                 up  1.00000          1.00000
-32 0.30750     host ip-172-31-20-79
 30 0.30750         osd.30                 up  1.00000          1.00000
-33 0.30750     host ip-172-31-23-140
 31 0.30750         osd.31                 up  1.00000          1.00000

Output of ceph health detail:

HEALTH_WARN 1 pgs backfill_wait; 55 pgs degraded; 1 pgs recovering; 54 pgs recovery_wait; 55 pgs stuck degraded; 56 pgs stuck unclean; recovery 49688/1369003 objects degraded (3.630%); recovery 854/1369003 objects misplaced (0.062%)
pg 3.b is stuck unclean for 3620.478034, current state active+recovery_wait+degraded, last acting [30,11,31,20,17,3,1,25,28,29,7,24]
pg 3.f is stuck unclean for 2574.807568, current state active+recovery_wait+degraded, last acting [27,26,3,0,18,19,11,10,9,17,8,21]
pg 3.11 is stuck unclean for 5031.004347, current state active+recovery_wait+degraded, last acting [30,3,2,7,4,17,14,23,5,16,13,29]
pg 3.24 is stuck unclean for 3611.733994, current state active+recovery_wait+degraded, last acting [12,14,17,30,1,16,24,3,27,22,0,18]
pg 3.2f is stuck unclean for 5562.733823, current state active+recovery_wait+degraded, last acting [22,24,5,27,10,2,3,0,17,15,23,7]
pg 3.3b is stuck unclean for 5000.158982, current state active+recovery_wait+degraded, last acting [19,11,16,4,28,30,21,8,31,5,13,27]
pg 3.aa is stuck unclean for 4827.355024, current state active+recovery_wait+degraded, last acting [12,10,20,0,22,9,19,24,2,3,16,5]
pg 3.79 is stuck unclean for 3652.909790, current state active+remapped+backfill_wait, last acting [25,1,4,19,23,6,5,2,27,12,16,8]
pg 3.ab is stuck unclean for 5607.537767, current state active+recovery_wait+degraded, last acting [19,3,30,11,0,4,22,25,16,12,8,14]
pg 3.1b is stuck unclean for 4704.402285, current state active+recovery_wait+degraded, last acting [17,10,7,27,16,26,23,1,11,9,0,14]
pg 3.7a is stuck unclean for 4465.053715, current state active+recovery_wait+degraded, last acting [17,8,2,19,14,16,31,20,29,26,15,9]
pg 3.49 is stuck unclean for 4052.718824, current state active+recovery_wait+degraded, last acting [9,3,1,16,8,7,11,14,19,13,12,18]
pg 3.ac is stuck unclean for 4940.338938, current state active+recovery_wait+degraded, last acting [8,2,3,0,5,10,18,12,16,7,17,1]
pg 3.83 is stuck unclean for 4381.695898, current state active+recovery_wait+degraded, last acting [18,12,21,15,16,27,3,26,28,5,20,19]
pg 3.52 is stuck unclean for 4337.289527, current state active+recovery_wait+degraded, last acting [17,24,20,23,4,14,18,27,8,22,9,31]
pg 3.ae is stuck unclean for 5107.221614, current state active+recovery_wait+degraded, last acting [27,3,25,7,11,9,8,30,13,23,0,2]
pg 3.b4 is stuck unclean for 4687.534444, current state active+recovery_wait+degraded, last acting [7,30,10,19,31,23,13,1,18,25,28,0]
pg 3.bd is stuck unclean for 5099.627501, current state active+recovery_wait+degraded, last acting [4,3,15,7,23,17,9,31,20,12,21,24]
pg 3.ad is stuck unclean for 4907.243126, current state active+recovery_wait+degraded, last acting [24,8,1,21,30,27,25,13,7,0,11,19]
pg 3.af is stuck unclean for 3950.747953, current state active+recovery_wait+degraded, last acting [30,23,25,8,11,15,13,14,18,24,0,21]
pg 3.7e is stuck unclean for 3461.008617, current state active+recovery_wait+degraded, last acting [22,15,12,16,4,0,30,14,31,23,10,17]
pg 3.97 is stuck unclean for 5330.236878, current state active+recovery_wait+degraded, last acting [19,10,24,14,13,21,2,8,31,29,30,20]
pg 3.f2 is stuck unclean for 2731.659626, current state active+recovery_wait+degraded, last acting [31,13,2,16,0,14,3,29,1,26,7,10]
pg 3.c6 is stuck unclean for 6306.423348, current state active+recovery_wait+degraded, last acting [0,10,28,31,12,4,5,25,24,13,2,18]
pg 3.67 is stuck unclean for 5118.168893, current state active+recovery_wait+degraded, last acting [9,15,29,18,25,7,17,30,4,12,26,23]
pg 3.b5 is stuck unclean for 4369.784919, current state active+recovery_wait+degraded, last acting [17,3,28,5,15,4,16,25,11,0,26,31]
pg 3.5b is stuck unclean for 2621.626018, current state active+recovery_wait+degraded, last acting [4,15,14,30,28,1,12,10,2,29,24,18]
pg 3.f8 is stuck unclean for 4522.911060, current state active+recovery_wait+degraded, last acting [18,3,2,29,26,9,17,5,22,13,31,21]
pg 3.3c is stuck unclean for 3337.005364, current state active+recovery_wait+degraded, last acting [2,24,16,20,18,25,26,10,23,12,19,31]
pg 3.ec is stuck unclean for 5592.096810, current state active+recovery_wait+degraded, last acting [18,11,27,9,26,1,22,31,0,10,24,15]
pg 3.92 is stuck unclean for 5533.331735, current state active+recovery_wait+degraded, last acting [13,11,31,0,22,12,9,10,28,3,21,2]
pg 3.c0 is stuck unclean for 5214.160745, current state active+recovery_wait+degraded, last acting [12,28,31,30,2,24,15,22,9,18,3,25]
pg 3.61 is stuck unclean for 3880.126824, current state active+recovery_wait+degraded, last acting [4,8,24,15,0,28,16,19,13,1,18,27]
pg 3.eb is stuck unclean for 5268.977639, current state active+recovery_wait+degraded, last acting [8,25,1,16,30,14,18,9,21,24,4,7]
pg 3.b8 is stuck unclean for 4399.307382, current state active+recovery_wait+degraded, last acting [16,21,28,30,7,17,1,2,14,8,0,13]
pg 3.d1 is stuck unclean for 3577.663496, current state active+recovery_wait+degraded, last acting [0,28,22,31,20,4,11,10,2,1,25,24]
pg 3.89 is stuck unclean for 5730.882619, current state active+recovery_wait+degraded, last acting [4,5,1,2,0,9,24,11,14,13,15,28]
pg 3.e8 is stuck unclean for 6516.175205, current state active+recovery_wait+degraded, last acting [23,11,28,7,8,14,27,9,30,31,24,5]
pg 3.34 is stuck unclean for 5472.972458, current state active+recovery_wait+degraded, last acting [19,8,16,31,27,22,18,0,30,4,1,11]
pg 3.fa is stuck unclean for 3740.578030, current state active+recovering+degraded, last acting [2,1,18,17,25,19,23,24,3,8,12,30]
pg 3.9b is stuck unclean for 4914.758904, current state active+recovery_wait+degraded, last acting [23,15,26,27,12,28,3,4,8,30,0,1]
pg 3.91 is stuck unclean for 4486.518498, current state active+recovery_wait+degraded, last acting [9,14,27,11,1,23,7,17,5,16,18,0]
pg 3.26 is stuck unclean for 5068.577531, current state active+recovery_wait+degraded, last acting [9,25,16,24,12,2,17,22,31,29,26,7]
pg 3.85 is stuck unclean for 5229.745995, current state active+recovery_wait+degraded, last acting [12,3,22,30,16,2,20,28,8,0,25,4]
pg 3.e0 is stuck unclean for 2662.946214, current state active+recovery_wait+degraded, last acting [17,28,20,19,4,9,15,25,16,0,23,22]
pg 3.81 is stuck unclean for 4265.267581, current state active+recovery_wait+degraded, last acting [13,4,0,19,10,17,16,24,12,26,3,20]
pg 3.14 is stuck unclean for 4366.392617, current state active+recovery_wait+degraded, last acting [20,0,18,16,30,25,12,31,4,3,5,29]
pg 3.7b is stuck unclean for 5133.369388, current state active+recovery_wait+degraded, last acting [4,22,30,1,21,5,12,19,17,0,2,23]
pg 3.78 is stuck unclean for 5286.596260, current state active+recovery_wait+degraded, last acting [23,26,18,3,13,14,19,7,0,12,25,17]
pg 3.d0 is stuck unclean for 5293.763984, current state active+recovery_wait+degraded, last acting [24,10,4,12,2,25,9,23,8,15,29,7]
pg 3.71 is stuck unclean for 4571.041709, current state active+recovery_wait+degraded, last acting [25,9,27,29,16,13,11,3,18,19,26,4]
pg 3.ca is stuck unclean for 5465.875924, current state active+recovery_wait+degraded, last acting [17,24,21,3,16,14,25,10,2,5,28,18]
pg 3.6b is stuck unclean for 4627.831337, current state active+recovery_wait+degraded, last acting [21,1,4,20,27,7,17,24,3,0,29,25]
pg 3.69 is stuck unclean for 4757.583113, current state active+recovery_wait+degraded, last acting [8,26,4,30,11,9,16,12,18,27,14,19]
pg 3.5c is stuck unclean for 5362.827077, current state active+recovery_wait+degraded, last acting [14,29,4,1,19,17,9,0,3,16,24,2]
pg 3.51 is stuck unclean for 2778.350320, current state active+recovery_wait+degraded, last acting [13,31,11,22,25,30,1,3,27,23,21,17]
pg 3.b is stuck degraded for 2292.794292, current state active+recovery_wait+degraded, last acting [30,11,31,20,17,3,1,25,28,29,7,24]
pg 3.f is stuck degraded for 2292.771080, current state active+recovery_wait+degraded, last acting [27,26,3,0,18,19,11,10,9,17,8,21]
pg 3.11 is stuck degraded for 2292.797135, current state active+recovery_wait+degraded, last acting [30,3,2,7,4,17,14,23,5,16,13,29]
pg 3.24 is stuck degraded for 2292.825615, current state active+recovery_wait+degraded, last acting [12,14,17,30,1,16,24,3,27,22,0,18]
pg 3.2f is stuck degraded for 2292.787887, current state active+recovery_wait+degraded, last acting [22,24,5,27,10,2,3,0,17,15,23,7]
pg 3.3b is stuck degraded for 2292.823674, current state active+recovery_wait+degraded, last acting [19,11,16,4,28,30,21,8,31,5,13,27]
pg 3.3c is stuck degraded for 2292.813364, current state active+recovery_wait+degraded, last acting [2,24,16,20,18,25,26,10,23,12,19,31]
pg 3.49 is stuck degraded for 2292.804643, current state active+recovery_wait+degraded, last acting [9,3,1,16,8,7,11,14,19,13,12,18]
pg 3.51 is stuck degraded for 2292.798396, current state active+recovery_wait+degraded, last acting [13,31,11,22,25,30,1,3,27,23,21,17]
pg 3.52 is stuck degraded for 2292.799715, current state active+recovery_wait+degraded, last acting [17,24,20,23,4,14,18,27,8,22,9,31]
pg 3.5b is stuck degraded for 2292.776512, current state active+recovery_wait+degraded, last acting [4,15,14,30,28,1,12,10,2,29,24,18]
pg 3.5c is stuck degraded for 2292.808334, current state active+recovery_wait+degraded, last acting [14,29,4,1,19,17,9,0,3,16,24,2]
pg 3.69 is stuck degraded for 2292.809014, current state active+recovery_wait+degraded, last acting [8,26,4,30,11,9,16,12,18,27,14,19]
pg 3.78 is stuck degraded for 2292.798826, current state active+recovery_wait+degraded, last acting [23,26,18,3,13,14,19,7,0,12,25,17]
pg 3.1b is stuck degraded for 2292.798541, current state active+recovery_wait+degraded, last acting [17,10,7,27,16,26,23,1,11,9,0,14]
pg 3.7a is stuck degraded for 2292.803093, current state active+recovery_wait+degraded, last acting [17,8,2,19,14,16,31,20,29,26,15,9]
pg 3.14 is stuck degraded for 2292.793869, current state active+recovery_wait+degraded, last acting [20,0,18,16,30,25,12,31,4,3,5,29]
pg 3.7b is stuck degraded for 2292.782484, current state active+recovery_wait+degraded, last acting [4,22,30,1,21,5,12,19,17,0,2,23]
pg 3.7e is stuck degraded for 2292.774470, current state active+recovery_wait+degraded, last acting [22,15,12,16,4,0,30,14,31,23,10,17]
pg 3.83 is stuck degraded for 2292.795022, current state active+recovery_wait+degraded, last acting [18,12,21,15,16,27,3,26,28,5,20,19]
pg 3.26 is stuck degraded for 2292.807846, current state active+recovery_wait+degraded, last acting [9,25,16,24,12,2,17,22,31,29,26,7]
pg 3.85 is stuck degraded for 2292.813155, current state active+recovery_wait+degraded, last acting [12,3,22,30,16,2,20,28,8,0,25,4]
pg 3.91 is stuck degraded for 2292.810660, current state active+recovery_wait+degraded, last acting [9,14,27,11,1,23,7,17,5,16,18,0]
pg 3.92 is stuck degraded for 2292.809843, current state active+recovery_wait+degraded, last acting [13,11,31,0,22,12,9,10,28,3,21,2]
pg 3.97 is stuck degraded for 2292.782984, current state active+recovery_wait+degraded, last acting [19,10,24,14,13,21,2,8,31,29,30,20]
pg 3.aa is stuck degraded for 2292.805640, current state active+recovery_wait+degraded, last acting [12,10,20,0,22,9,19,24,2,3,16,5]
pg 3.ab is stuck degraded for 2292.766750, current state active+recovery_wait+degraded, last acting [19,3,30,11,0,4,22,25,16,12,8,14]
pg 3.ac is stuck degraded for 2292.817247, current state active+recovery_wait+degraded, last acting [8,2,3,0,5,10,18,12,16,7,17,1]
pg 3.ad is stuck degraded for 2292.811631, current state active+recovery_wait+degraded, last acting [24,8,1,21,30,27,25,13,7,0,11,19]
pg 3.ae is stuck degraded for 2292.765243, current state active+recovery_wait+degraded, last acting [27,3,25,7,11,9,8,30,13,23,0,2]
pg 3.af is stuck degraded for 2292.785730, current state active+recovery_wait+degraded, last acting [30,23,25,8,11,15,13,14,18,24,0,21]
pg 3.b4 is stuck degraded for 2292.807764, current state active+recovery_wait+degraded, last acting [7,30,10,19,31,23,13,1,18,25,28,0]
pg 3.b5 is stuck degraded for 2292.802932, current state active+recovery_wait+degraded, last acting [17,3,28,5,15,4,16,25,11,0,26,31]
pg 3.b8 is stuck degraded for 2292.789546, current state active+recovery_wait+degraded, last acting [16,21,28,30,7,17,1,2,14,8,0,13]
pg 3.bd is stuck degraded for 2292.777194, current state active+recovery_wait+degraded, last acting [4,3,15,7,23,17,9,31,20,12,21,24]
pg 3.61 is stuck degraded for 2292.780051, current state active+recovery_wait+degraded, last acting [4,8,24,15,0,28,16,19,13,1,18,27]
pg 3.c0 is stuck degraded for 2292.813792, current state active+recovery_wait+degraded, last acting [12,28,31,30,2,24,15,22,9,18,3,25]
pg 3.67 is stuck degraded for 2292.810551, current state active+recovery_wait+degraded, last acting [9,15,29,18,25,7,17,30,4,12,26,23]
pg 3.c6 is stuck degraded for 2292.813695, current state active+recovery_wait+degraded, last acting [0,10,28,31,12,4,5,25,24,13,2,18]
pg 3.6b is stuck degraded for 2292.784572, current state active+recovery_wait+degraded, last acting [21,1,4,20,27,7,17,24,3,0,29,25]
pg 3.ca is stuck degraded for 2292.802657, current state active+recovery_wait+degraded, last acting [17,24,21,3,16,14,25,10,2,5,28,18]
pg 3.71 is stuck degraded for 2292.745595, current state active+recovery_wait+degraded, last acting [25,9,27,29,16,13,11,3,18,19,26,4]
pg 3.d0 is stuck degraded for 2292.810869, current state active+recovery_wait+degraded, last acting [24,10,4,12,2,25,9,23,8,15,29,7]
pg 3.d1 is stuck degraded for 2292.797445, current state active+recovery_wait+degraded, last acting [0,28,22,31,20,4,11,10,2,1,25,24]
pg 3.81 is stuck degraded for 2292.803404, current state active+recovery_wait+degraded, last acting [13,4,0,19,10,17,16,24,12,26,3,20]
pg 3.e0 is stuck degraded for 2292.763504, current state active+recovery_wait+degraded, last acting [17,28,20,19,4,9,15,25,16,0,23,22]
pg 3.89 is stuck degraded for 2292.779741, current state active+recovery_wait+degraded, last acting [4,5,1,2,0,9,24,11,14,13,15,28]
pg 3.e8 is stuck degraded for 2292.762470, current state active+recovery_wait+degraded, last acting [23,11,28,7,8,14,27,9,30,31,24,5]
pg 3.eb is stuck degraded for 2292.823880, current state active+recovery_wait+degraded, last acting [8,25,1,16,30,14,18,9,21,24,4,7]
pg 3.ec is stuck degraded for 2292.820337, current state active+recovery_wait+degraded, last acting [18,11,27,9,26,1,22,31,0,10,24,15]
pg 3.f2 is stuck degraded for 2292.781004, current state active+recovery_wait+degraded, last acting [31,13,2,16,0,14,3,29,1,26,7,10]
pg 3.f8 is stuck degraded for 2292.791270, current state active+recovery_wait+degraded, last acting [18,3,2,29,26,9,17,5,22,13,31,21]
pg 3.34 is stuck degraded for 2292.824069, current state active+recovery_wait+degraded, last acting [19,8,16,31,27,22,18,0,30,4,1,11]
pg 3.9b is stuck degraded for 2292.762747, current state active+recovery_wait+degraded, last acting [23,15,26,27,12,28,3,4,8,30,0,1]
pg 3.fa is stuck degraded for 2292.808553, current state active+recovering+degraded, last acting [2,1,18,17,25,19,23,24,3,8,12,30]
pg 3.fa is active+recovering+degraded, acting [2,1,18,17,25,19,23,24,3,8,12,30]
pg 3.f8 is active+recovery_wait+degraded, acting [18,3,2,29,26,9,17,5,22,13,31,21]
pg 3.f2 is active+recovery_wait+degraded, acting [31,13,2,16,0,14,3,29,1,26,7,10]
pg 3.ec is active+recovery_wait+degraded, acting [18,11,27,9,26,1,22,31,0,10,24,15]
pg 3.eb is active+recovery_wait+degraded, acting [8,25,1,16,30,14,18,9,21,24,4,7]
pg 3.e8 is active+recovery_wait+degraded, acting [23,11,28,7,8,14,27,9,30,31,24,5]
pg 3.e0 is active+recovery_wait+degraded, acting [17,28,20,19,4,9,15,25,16,0,23,22]
pg 3.d1 is active+recovery_wait+degraded, acting [0,28,22,31,20,4,11,10,2,1,25,24]
pg 3.d0 is active+recovery_wait+degraded, acting [24,10,4,12,2,25,9,23,8,15,29,7]
pg 3.ca is active+recovery_wait+degraded, acting [17,24,21,3,16,14,25,10,2,5,28,18]
pg 3.c6 is active+recovery_wait+degraded, acting [0,10,28,31,12,4,5,25,24,13,2,18]
pg 3.c0 is active+recovery_wait+degraded, acting [12,28,31,30,2,24,15,22,9,18,3,25]
pg 3.bd is active+recovery_wait+degraded, acting [4,3,15,7,23,17,9,31,20,12,21,24]
pg 3.b8 is active+recovery_wait+degraded, acting [16,21,28,30,7,17,1,2,14,8,0,13]
pg 3.b5 is active+recovery_wait+degraded, acting [17,3,28,5,15,4,16,25,11,0,26,31]
pg 3.b4 is active+recovery_wait+degraded, acting [7,30,10,19,31,23,13,1,18,25,28,0]
pg 3.af is active+recovery_wait+degraded, acting [30,23,25,8,11,15,13,14,18,24,0,21]
pg 3.ae is active+recovery_wait+degraded, acting [27,3,25,7,11,9,8,30,13,23,0,2]
pg 3.ad is active+recovery_wait+degraded, acting [24,8,1,21,30,27,25,13,7,0,11,19]
pg 3.ac is active+recovery_wait+degraded, acting [8,2,3,0,5,10,18,12,16,7,17,1]
pg 3.ab is active+recovery_wait+degraded, acting [19,3,30,11,0,4,22,25,16,12,8,14]
pg 3.aa is active+recovery_wait+degraded, acting [12,10,20,0,22,9,19,24,2,3,16,5]
pg 3.9b is active+recovery_wait+degraded, acting [23,15,26,27,12,28,3,4,8,30,0,1]
pg 3.97 is active+recovery_wait+degraded, acting [19,10,24,14,13,21,2,8,31,29,30,20]
pg 3.92 is active+recovery_wait+degraded, acting [13,11,31,0,22,12,9,10,28,3,21,2]
pg 3.91 is active+recovery_wait+degraded, acting [9,14,27,11,1,23,7,17,5,16,18,0]
pg 3.89 is active+recovery_wait+degraded, acting [4,5,1,2,0,9,24,11,14,13,15,28]
pg 3.85 is active+recovery_wait+degraded, acting [12,3,22,30,16,2,20,28,8,0,25,4]
pg 3.83 is active+recovery_wait+degraded, acting [18,12,21,15,16,27,3,26,28,5,20,19]
pg 3.81 is active+recovery_wait+degraded, acting [13,4,0,19,10,17,16,24,12,26,3,20]
pg 3.7e is active+recovery_wait+degraded, acting [22,15,12,16,4,0,30,14,31,23,10,17]
pg 3.7b is active+recovery_wait+degraded, acting [4,22,30,1,21,5,12,19,17,0,2,23]
pg 3.7a is active+recovery_wait+degraded, acting [17,8,2,19,14,16,31,20,29,26,15,9]
pg 3.79 is active+remapped+backfill_wait, acting [25,1,4,19,23,6,5,2,27,12,16,8]
pg 3.78 is active+recovery_wait+degraded, acting [23,26,18,3,13,14,19,7,0,12,25,17]
pg 3.71 is active+recovery_wait+degraded, acting [25,9,27,29,16,13,11,3,18,19,26,4]
pg 3.6b is active+recovery_wait+degraded, acting [21,1,4,20,27,7,17,24,3,0,29,25]
pg 3.69 is active+recovery_wait+degraded, acting [8,26,4,30,11,9,16,12,18,27,14,19]
pg 3.67 is active+recovery_wait+degraded, acting [9,15,29,18,25,7,17,30,4,12,26,23]
pg 3.61 is active+recovery_wait+degraded, acting [4,8,24,15,0,28,16,19,13,1,18,27]
pg 3.5c is active+recovery_wait+degraded, acting [14,29,4,1,19,17,9,0,3,16,24,2]
pg 3.5b is active+recovery_wait+degraded, acting [4,15,14,30,28,1,12,10,2,29,24,18]
pg 3.52 is active+recovery_wait+degraded, acting [17,24,20,23,4,14,18,27,8,22,9,31]
pg 3.51 is active+recovery_wait+degraded, acting [13,31,11,22,25,30,1,3,27,23,21,17]
pg 3.49 is active+recovery_wait+degraded, acting [9,3,1,16,8,7,11,14,19,13,12,18]
pg 3.3c is active+recovery_wait+degraded, acting [2,24,16,20,18,25,26,10,23,12,19,31]
pg 3.3b is active+recovery_wait+degraded, acting [19,11,16,4,28,30,21,8,31,5,13,27]
pg 3.34 is active+recovery_wait+degraded, acting [19,8,16,31,27,22,18,0,30,4,1,11]
pg 3.2f is active+recovery_wait+degraded, acting [22,24,5,27,10,2,3,0,17,15,23,7]
pg 3.26 is active+recovery_wait+degraded, acting [9,25,16,24,12,2,17,22,31,29,26,7]
pg 3.24 is active+recovery_wait+degraded, acting [12,14,17,30,1,16,24,3,27,22,0,18]
pg 3.1b is active+recovery_wait+degraded, acting [17,10,7,27,16,26,23,1,11,9,0,14]
pg 3.14 is active+recovery_wait+degraded, acting [20,0,18,16,30,25,12,31,4,3,5,29]
pg 3.11 is active+recovery_wait+degraded, acting [30,3,2,7,4,17,14,23,5,16,13,29]
pg 3.f is active+recovery_wait+degraded, acting [27,26,3,0,18,19,11,10,9,17,8,21]
pg 3.b is active+recovery_wait+degraded, acting [30,11,31,20,17,3,1,25,28,29,7,24]
recovery 49688/1369003 objects degraded (3.630%)
recovery 854/1369003 objects misplaced (0.062%)

Am 19.09.2017 um 22:15 schrieb David Turner <drakonstein@xxxxxxxxx>:

Can you please provide the output of `ceph status`, `ceph osd tree`, and `ceph health detail`?  Thank you.

On Tue, Sep 19, 2017 at 2:59 PM Jonas Jaszkowic <jonasjaszkowic.work@xxxxxxxxx> wrote:
Hi all, 
I have setup a Ceph cluster consisting of one monitor, 32 OSD hosts (1 OSD of size 320GB per host) and 16 clients which are reading
and writing to the cluster. I have one erasure coded pool (shec plugin) with k=8, m=4, c=3 and pg_num=256. Failure domain is host.
I am able to reach a HEALTH_OK state and everything is working as expected. The pool was populated with
114048 files of different sizes ranging from 1kB to 4GB. Total amount of data in the pool was around 3TB. The capacity of the
pool was around 10TB.

I want to evaluate how Ceph is rebalancing data in case of an OSD loss while clients are still reading. To do so, I am killing one OSD on purpose
via ceph osd out <osd-id> without adding a new one, i.e. I have 31 OSDs left. Ceph seems to notice this failure and starts to rebalance data
which I can observe with the ceph -w command.

However, Ceph failed to rebalance the data. The recovering process seemed to be stuck at a random point. I waited more than 12h but the
number of degraded objects did not reduce and some PGs were stuck. Why is this happening? Based on the number of OSDs and the k,m,c values 
there should be enough hosts and OSDs to be able to recover from a single OSD failure?

Thank you in advance!
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